/**
* @file speech_server.hpp
* @author zhaobohan (zhaobohan_free@163.com)
* @brief 实现语音识别子服务
*/
#include <brpc/server.h>
#include <butil/logging.h>

#include "asr.hpp"      // 语音识别模块封装
#include "etcd.hpp"     // 服务注册模块封装
#include "logger.hpp"   // 日志模块封装
#include "speech.pb.h"  // protobuf框架代码

namespace free_im {
class SpeechServiceImpl : public free_im::SpeechService 
{
public:
    SpeechServiceImpl(const ASRClient::ptr &asr_client):
        _asr_client(asr_client)
    {}

    ~SpeechServiceImpl()
    {}

    void SpeechRecognition(google::protobuf::RpcController* controller,
                    const ::free_im::SpeechRecognitionReq* request,
                    ::free_im::SpeechRecognitionRsp* response,
                    ::google::protobuf::Closure* done) 
    {
        LOG_DEBUG("收到语音转文字请求！");
        brpc::ClosureGuard rpc_guard(done);
        // 1. 取出请求中的语音数据
        // 2. 调用语音sdk模块进行语音识别，得到响应
        std::string err;
        std::string res = _asr_client->recognize(request->speech_content(), err);
        if (res.empty()) 
        {
            LOG_ERROR("{} 语音识别失败！", request->request_id());
            response->set_request_id(request->request_id());
            response->set_success(false);
            response->set_errmsg("语音识别失败:" + err);
            return;
        }

        // 3. 组织响应
        response->set_request_id(request->request_id());
        response->set_success(true);
        response->set_recognition_result(res);
    }
private:
    ASRClient::ptr _asr_client;
};

class SpeechServer 
{
public:
    using ptr = std::shared_ptr<SpeechServer>;
    SpeechServer(const ASRClient::ptr asr_client, 
        const Registry::ptr &reg_client,
        const std::shared_ptr<brpc::Server> &server):
        _asr_client(asr_client),
        _reg_client(reg_client),
        _rpc_server(server)
    {}
    
    ~SpeechServer()
    {}

    // 搭建RPC服务器，并启动服务器
    void start() 
    {
        _rpc_server->RunUntilAskedToQuit();
    }

private:
    ASRClient::ptr _asr_client;
    Registry::ptr _reg_client;
    std::shared_ptr<brpc::Server> _rpc_server;
};

class SpeechServerBuilder 
{
public:
    // 构造语音识别客户端对象
    void make_asr_object(const std::string &app_id,
        const std::string &api_key,
        const std::string &secret_key) 
    {
        _asr_client = std::make_shared<ASRClient>(app_id, api_key, secret_key);
    }

    // 用于构造服务注册客户端对象
    void make_reg_object(const std::string &reg_host,
        const std::string &service_name,
        const std::string &access_host) 
    {
        _reg_client = std::make_shared<Registry>(reg_host);
        _reg_client->registry(service_name, access_host);
    }

    // 构造RPC服务器对象
    void make_rpc_server(uint16_t port, int32_t timeout, uint8_t num_threads) 
    {
        if (!_asr_client) 
        {
            LOG_ERROR("还未初始化语音识别模块！");
            abort();
        }

        _rpc_server = std::make_shared<brpc::Server>();
        SpeechServiceImpl *speech_service = new SpeechServiceImpl(_asr_client);
        int ret = _rpc_server->AddService(speech_service, 
            brpc::ServiceOwnership::SERVER_OWNS_SERVICE);
        if (ret == -1) 
        {
            LOG_ERROR("添加Rpc服务失败！");
            abort();
        }
        brpc::ServerOptions options;
        options.idle_timeout_sec = timeout;
        options.num_threads = num_threads;
        ret = _rpc_server->Start(port, &options);
        if (ret == -1) 
        {
            LOG_ERROR("服务启动失败！");
            abort();
        }
    }

    SpeechServer::ptr build()
    {
        if (!_asr_client) 
        {
            LOG_ERROR("还未初始化语音识别模块！");
            abort();
        }

        if (!_reg_client) 
        {
            LOG_ERROR("还未初始化服务注册模块！");
            abort();
        }

        if (!_rpc_server) 
        {
            LOG_ERROR("还未初始化RPC服务器模块！");
            abort();
        }

        SpeechServer::ptr server = std::make_shared<SpeechServer>(
            _asr_client, _reg_client, _rpc_server);
        return server;
    }
    
private:
    ASRClient::ptr _asr_client;
    Registry::ptr _reg_client;
    std::shared_ptr<brpc::Server> _rpc_server;
};
}